Lighting device for vehicles

Abstract

A method for symmetrising the branches of a lighting device for vehicles having at least two LED branches (ZW 1 , ZW 2 . . . ZWn) connected in parallel. Each branch has at least one series resistor (R 1 . . . Rn) and at least one LED (D 11 . . . Dn 2 ) connected in series. The at least one series resistor (R 1 . . . Rn) of each branch is bridged by a conducting track (LA 1 . . . LAn) provided on a printed circuit board. This conducting track is accessible for a tool of a depanelling device, with the aid of which said conducting track can be severed. The current through each branch and/or the brightness of at least one LED (D 11 . . . Dn 2 ) is measured in each branch, and in a branch in which the measured current and/or the measured brightness exceeds a definable limit value, the bridging conducting track of the at least one series resistor is severed with aid of the tool.

1 . A method for symmetrising the branches of a lighting device for vehicles having at least two LED branches (ZW 1 , ZW 2  . . . ZWn) connected in parallel, wherein each branch has at least one series resistor (R 1  . . . Rn) and at least one LED (D 11  . . . Dn 2 ) connected in series,
 wherein the at least one series resistor (R 1  . . . Rn) of each branch is bridged by a conducting track (LA 1  . . . LAn) provided on a printed circuit board, wherein this conducting track is accessible for a tool of a depanelling device, with the aid of which said conducting track can be severed, 
 wherein the current through each branch and/or the brightness of at least one LED (D 11  . . . Dn 2 ) is measured in each branch, and 
 wherein in a branch in which the measured current and/or the measured brightness exceeds a definable limit value, the bridging conducting track of the at least one series resistor is severed with the aid of the tool. 
 
     
     
         2 . The method according to  claim 1 , wherein the series connection of a conducting track (LN) arranged on a printed circuit board and of a shunt resistor (RN) is connected in parallel to a series resistor (R). 
     
     
         3 . The method according to  claim 1 , wherein each branch (ZW 1  . . . ZWn) has at least two series resistors (R 11 , R 12  . . . Rn 1 , Rn 2 ) arranged in series, wherein at least one series resistor of each branch is bridged by a conducting track (LA 11  . . . LAn 2 ) provided on a printed circuit board. 
     
     
         4 . The method according to  claim 1 , wherein a miller of a depanelling device for printed circuit boards is used as tool. 
     
     
         5 . A lighting device for vehicles, the device comprising:
 at least two LED branches (ZW 1 , ZW 2  . . . ZWn) connected in parallel, wherein each branch has at least one series resistor (R 1  . . . Rn) and at least one LED (D 11  . . . Dn 2 ) connected in series, wherein the lighting device is configured to symmetrise the at least two LED branches in accordance with a method according to  claim 1 ,   wherein the at least one series resistor (R 1  . . . Rn) of each branch (ZW 1  . . . ZWn) is bridged by a conducting track (LA 1  . . . LAn) provided on a printed circuit board, and   wherein the conducting track is accessible for a tool of a depanelling device, with the aid of which said conducting track can be severed.   
     
     
         6 . The lighting device according to  claim 5 , wherein the series connection of a conducting track (LN) arranged on the printed circuit board and of a shunt resistor (RN) is connected in parallel to a series resistor (R). 
     
     
         7 . The lighting device according to  claim 5  wherein each branch (ZW 1  . . . ZWn) has at least two series resistors (R 11 , R 12  . . . Rn 1 , Rn 2 ) arranged in series, wherein at least one series resistor of the branch is bridged by a conducting track (LA 11  . . . LAn 2 ) provided on a printed circuit board.